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Relative frequencies / proportions with dplyr
...()) %>%
mutate(freq = n / sum(n))
# am gear n freq
# 1 0 3 15 0.7894737
# 2 0 4 4 0.2105263
# 3 1 4 8 0.6153846
# 4 1 5 5 0.3846154
From the dplyr vignette:
When you group by multiple variables, each summary peels off one level of the grouping. That makes it ea...
Have a fixed position div that needs to scroll if content overflows
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answered Aug 21 '13 at 20:01
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What is a bank conflict? (Doing Cuda/OpenCL programming)
...e serialized (this is a bank conflict). For gt200 gpus there are 16 banks (32banks for fermi), 16 or 32 banks for AMD gpus (57xx or higher: 32, everything below: 16)), which are interleaved with a granuity of 32bit (so byte 0-3 are in bank 1, 4-7 in bank 2, ..., 64-69 in bank 1 and so on). For a bet...
Ruby, remove last N characters from a string?
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13 Answers
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What is sys.maxint in Python 3?
...a maximum integer, and I've read to use "sys.maxint" . However, in Python 3 when I call it I get:
6 Answers
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Convert boolean result into number/integer
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355
Javascript has a ternary operator you could use:
var i = result ? 1 : 0;
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Data structure for loaded dice?
...t time) with a one-time O(n) set-up. You can find it documented in chapter 3 (PDF) of "Non-Uniform Random Variate Generation" by Luc Devroye.
The idea is to take your array of probabilities pk and produce three new n-element arrays, qk, ak, and bk. Each qk is a probability between 0 and 1, and each...
How to get the last N rows of a pandas DataFrame?
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3 Answers
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How to check SQL Server version
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230
Following are possible ways to see the version:
Method 1: Connect to the instance of SQL Serve...
The order of keys in dictionaries
...es Python 2.7) or higher.
Also, note that OrderedDict({'a': 1, 'b':2, 'c':3}) won't work since the dict you create with {...} has already forgotten the order of the elements. Instead, you want to use OrderedDict([('a', 1), ('b', 2), ('c', 3)]).
As mentioned in the documentation, for versions lower...